This manual describes the ZHJQ series electric ball valves produced by Dayu. It covers the integrated structure, control signal options (4~20 mA DC, 1~5 V DC, relay), and the various body and seal materials suitable for viscous or particle‑laden media.
Detailed sections guide users through installation, adjustment of limit switches, trial operation, troubleshooting, and routine maintenance. Safety notes, environmental limits, and transport/storage requirements are also included to ensure reliable long‑term service. This manual is written in Chinese.
| Nominal Diameter (DN) | 15‑300 mm |
|---|---|
| Nominal Pressure | 1.6 MPa, 4.0 MPa, 6.4 MPa (custom up to 31.5 MPa) |
| Connection Type | Flanged (JB78‑59, JB79‑59) |
| Body Material | Carbon steel, stainless steel |
| Seal Material | PTFE (soft) or metal hard seal |
| Operating Temperature Range (soft seal) | -29 °C to 180 °C |
| Operating Temperature Range (hard seal) | -29 °C to 250 °C |
| Control Signal Options | Relay, 4~20 mA DC, 1~5 V DC |
| Power Supply | Single‑phase AC |
Drive the actuator to the fully closed position, loosen the adjustment screw D, turn it clockwise until micro‑switch K1 just actuates, then tighten the screw.
Connect the control circuit as shown, power on, set the switch to CLOSE to move the valve to the closed position until limit switch K1 triggers, then set to OPEN until K2 triggers.